S Vortex Exhaust

The vortex exhaust has a geometry that generates a rotating flow behind the opening. It is suitable for installation in a narrow space and it is tradi­tionally used with hand-held equipment producing jets of air and particles. This type of exhaust opening is also called a tornado exhaust or a cyclone exhaust.

Figure 12.39 shows an exhaust opening used for capture of concrete dust from a hand-held grinding machine. Figures 12.396 and 12.39c show two labo-

Re F FIGURE 12.40 Normalized velocity versus Reynolds number for a vortex exhaust. The location of the measuring point is indicated in the figure.

The T-connection in the original vortex exhaust will increase the pressure loss and increase the consumption of energy. Measurements of the pressure difference in the two versions show a sevenfold higher pressure difference in the original version (Fig. 12.396) compared with the pressure difference in the simplified version (Fig. 12.39c). This fact is very important in connection with selection of a given solution.

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